Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dung doi » huong doi, dung tai, dung co
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
xa dung » xay dung, xa dong, va dung
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cam tu » cam thu, nam tu, dam tu
tu xa » tu xay, tu va, te xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sanh)) ky nang xa hoi. ((hieu ve) or (hieu van)) cam tu xa dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cam tu xa dung doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky nang xa hoi. ((hieu ve) or (hieu van)) cam tu xa dung doi cua tre*.